Detergent tablet



FIG. 1 is a perspective view of a detergent tablet, embodying our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a side view thereof, all side views thereof being the same; and,

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a detergent tablet, as shown and described. 